Modular shelf



FIG. 1 is a perspective view of a modular shelf;

FIG. 2 is top view of a modular shelf;

FIG. 3 is a front view of modular shelf;

FIG. 4 is a side view of a modular shelf; and,

FIG. 5 is a bottom view of a modular shelf.

The ornamental design for a modular shelf, as shown.